Psalms 101:1

I will sing of mercy and judgment: unto thee, O LORD, will I sing.

² I will behave myself wisely in a perfect way. O when wilt thou come unto me? I will walk within my house with a perfect heart.

³ I will set no wicked thing before mine eyes: I hate the work of them that turn aside; it shall not cleave to me.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: I will sing of Your loving devotion and justice; to You, O LORD, I will sing praises.
KJV: I will sing of mercy and judgment: unto thee, O LORD, will I sing.
WEB: I will sing of loving kindness and justice. To you, LORD, I will sing praises.
ASV: I will sing of lovingkindness and justice: Unto thee, O Jehovah, will I sing praises.
DARBY: {A Psalm of David.} I will sing of loving-kindness and judgment: unto thee, Jehovah, will I sing psalms.
BLB: A Psalm. Of David. <span class=|reftext|><a href=|#|><b>1</b></a> I will sing of loving devotion and justice; to You, O YHWH, I will sing praises.

ÅB: Av David; en salme. Om miskunn og rett vil jeg synge; deg, Herre, vil jeg lovsynge.
OTB: Jeg vil synge om miskunn og rettferdighet;
Til deg, Herre, vil jeg synge lovsanger.
B1930: Av David; en salme. Om miskunn og rett vil jeg synge; dig, Herre, vil jeg lovsynge.

Psalms 89:1
I will sing of the mercies of the LORD for ever: with my mouth will I make known thy faithfulness to all generations.
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Psalms 71:22–23
I will also praise thee with the psaltery, even thy truth, O my God: unto thee will I sing with the harp, O thou Holy One of Israel.
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Revelation 19:1–3
And after these things I heard a great voice of much people in heaven, saying, Alleluia; Salvation, and glory, and honour, and power, unto the Lord our God:
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Psalms 145:7
They shall abundantly utter the memory of thy great goodness, and shall sing of thy righteousness.
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Psalms 51:14
Deliver me from bloodguiltiness, O God, thou God of my salvation: and my tongue shall sing aloud of thy righteousness.
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Romans 9:15–18
For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion.
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Revelation 15:3–4
And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
Read in context
Psalms 136:10–22
To him that smote Egypt in their firstborn: for his mercy endureth for ever:
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